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Shading photovoltaic power generation system low voltage ride through control method

A photovoltaic power generation system and low-voltage ride-through technology, applied in photovoltaic power generation, electrical components, circuit devices, etc., can solve problems such as no control strategy, achieve the effect of stabilizing voltage fluctuations and ensuring power balance

Active Publication Date: 2020-11-17
重庆涪陵电力实业股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There is currently no relevant control strategy

Method used

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  • Shading photovoltaic power generation system low voltage ride through control method
  • Shading photovoltaic power generation system low voltage ride through control method
  • Shading photovoltaic power generation system low voltage ride through control method

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Embodiment Construction

[0017] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0018] The low-voltage ride-through control method of the shading photovoltaic power generation system designed by the present invention is characterized in that it includes the following steps:

[0019] Step 1: The photovoltaic power generation system is based on the pre-distributed optimizer of the photovoltaic module to realize the decentralized control of the shading photovoltaic module;

[0020] Step 2: Through the output voltage and current random variables of the photovoltaic module, derive the photovoltaic cell environment correction parameters, and then correct the maximum power voltage in real time, so that the maximum power voltage can follow the external environment changes in real time, and realize the global maximum power tracking of the shading photovoltaic array;

[0021] Step 3: In the case of main grid failure, according to the...

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Abstract

The invention discloses a shading photovoltaic power generation system low-voltage ride-through control method. The method comprises the following steps of 1, enabling a photovoltaic power generationsystem to realize the shading photovoltaic module decentralized control based on a photovoltaic module preceding-stage distributed optimizer; 2, correcting a maximum power voltage in real time to enable the maximum power voltage to change along with the external environment in real time so as to realize the global maximum power tracking of a shading photovoltaic array; 3, switching an original maximum power point tracking operation mode of the photovoltaic module to a non-maximum power point tracking operation mode, reducing the output power of the photovoltaic array, and guaranteeing the power balance of two sides of a grid-connected inverter of the photovoltaic power generation system; and 4, introducing a current feedback item instantaneously injected at the direct current side, stabilizing the voltage fluctuation at the direct current side, and further eliminating the influence of the overcurrent and overvoltage of the inverter on the transient performance of the photovoltaic powergeneration system.

Description

technical field [0001] The invention relates to the technical field of photovoltaic power generation, in particular to a low-voltage ride-through control method for a shading photovoltaic power generation system. Background technique [0002] With the integration of high-penetration photovoltaic power generation systems into the main grid, if the photovoltaic power generation system adopts passive self-protection and disconnects from the system during the low-voltage failure of the main grid, it will increase the difficulty of power system fault recovery and even aggravate power system failures. Eventually, the power system collapsed. Therefore, the photovoltaic power generation system must take effective low voltage ride-through (LVRT) control measures to ensure the safe and stable operation of the power system. There is currently no relevant control strategy. Contents of the invention [0003] The purpose of the present invention is to provide a low-voltage ride-throug...

Claims

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Application Information

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IPC IPC(8): H02J3/38
CPCH02J3/381H02J2300/26Y02E10/56
Inventor 杨作祥马郭亮陈磊唐莎莎吴江张凤黄伟钢郑勇王晶晶白昕
Owner 重庆涪陵电力实业股份有限公司
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